Table 4.

Pain outcomes stratified by follow-up duration and pain condition.

Cannabis vs Placebo by Route of Administration	Duration of Treatment	N of Comparisons	Weighted Mean Difference on 0-10 VAS Pain	Notes
Neuropathic or chronic pain other than multiple sclerosis	1-14 days	14	−0.82 (−1.18 to −0.46)	Mild difference
	2-8 weeks	5	−1.19 (−1.79 to −0.60)	Difference > 1 point
	2-6 months	3	−0.92 (−1.80 to −0.03)	Mild difference
Multiple sclerosis pain	1-14 days	4	−0.35 (−0.64 to −0.06)	Mild difference
	2-8 weeks	10	−0.57 (−0.94 to −0.19)	Mild difference
	2-6 months	6	−0.36 (−0.71 to −0.02)	Mild difference
Rheumatoid arthritis pain	2-8 weeks	1	−0.50 (−1.85 to 0.85)	NS

Abbreviations: NS, not significant; VAS, visual analogue scale.